aDepartment of Civil Engineering, College of Engineering, Prince Mohammad Bin Fahd University, Al Khobar, Kingdom of Saudi Arabia.
Department of Civil and Environmental Engineering, Western University, London, ON, Canada.
Environ Technol. 2020 Mar;41(7):878-889. doi: 10.1080/09593330.2018.1513078. Epub 2018 Sep 2.
The specific objectives of the study were to determine the approximate design parameters for filter bed and highlight the possible scope of using mixed iron oxides rich smelter slag for or treatment. The batch and column study was conducted to assess the As removal capacities from contaminated water. X-ray fluorescence (XRF) analysis of the slag waste product determined the presence of large quantities of iron (Fe). In this study, the maximum removal capacities were found to be approximately 1.78 mg As per g of slag and 100% removal of As(V) was achieved during the first 30 days of three column operations. The changes in redox potential () values and the changes in effluent pH throughout the column operation period indicated redox reactions occurring in the system. The column experiments were modelled using a semi-analytic solution to the advection-dispersion-adsorption equation incorporated in the commercial software, Pollute V7. From the best-fit of the modelling results to the experimental breakthrough curves, the hydrodynamic dispersion coefficient (D) was found to be 0.0115 and 0.00775 m/day for column 1 and column 2, respectively, and 0.00862 m/day for column 3. The values of the distribution coefficient () were 0.18, 0.173 and 0.171 m/kg or L/g for the three columns and 0.24 L/g from the batch test. The results from the experiments may be used to aid the design of a filter bed or reactive barrier in a scenario where the mixed iron oxides rich smelter waste product is used as a candidate reactive medium.
本研究的具体目标是确定过滤床的近似设计参数，并强调利用富含混合铁氧化物的冶炼炉渣进行砷或硒处理的可能范围。通过批处理和柱试验来评估受污染水中砷的去除能力。炉渣废物的 X 射线荧光（XRF）分析确定存在大量的铁（Fe）。在本研究中，发现最大去除能力约为每克炉渣 1.78 毫克砷，并且在前 30 天的三个柱操作中实现了砷（V）的 100%去除。整个柱运行期间氧化还原电位（Eh）值的变化和出水中 pH 值的变化表明系统中发生了氧化还原反应。使用商业软件 Pollute V7 中包含的对流-弥散-吸附方程的半解析解对柱试验进行建模。根据模型结果与实验突破曲线的最佳拟合，发现柱 1 和柱 2 的水动力弥散系数（D）分别为 0.0115 和 0.00775 m/day，柱 3 的为 0.00862 m/day。分配系数（Kd）的值分别为 0.18、0.173 和 0.171 m/kg 或 L/g，三个柱的 Kd 值为 0.24 L/g，来自批处理试验。实验结果可用于辅助设计过滤床或反应性屏障，在这种情况下，混合铁氧化物丰富的冶炼炉渣废物被用作候选反应性介质。
